function hide_mail() {

var str1 = "greenwood";
var str2 = "gmail";
var str3 = "marta";
var str4 = "m";
var str5 = "co";
var str6 = "to:";
var str7 = "mail";

document.write("<a href=" + str7 + str6 + str3 + str1 + "@" + str2 + "." + str5 + str4 + ">Click Here</a>");

}